/*
 *  Copyright (c) WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
 *
 *  WSO2 Inc. licenses this file to you under the Apache License,
 *  Version 2.0 (the "License"); you may not use this file except
 *  in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.wso2.balana.attr.proxy;

import org.wso2.balana.attr.AttributeProxy;
import org.wso2.balana.attr.AttributeValue;

/**
 * Abstract represent of <code>AttributeProxy</code> introduces simple method
 * when there is no additional parameters to create the instance
 */
public abstract class AbstractAttributeProxy implements AttributeProxy {

	/**
	 * Tries to create a new <code>AttributeValue</code> based on the given
	 * String data.
	 * 
	 * @param value
	 *            the text form of some attribute data
	 * 
	 * @return an <code>AttributeValue</code> representing the given data
	 * 
	 * @throws Exception
	 *             if the data couldn't be used (the exception is typically
	 *             wrapping some other exception)
	 */
	public abstract AttributeValue getInstance(String value) throws Exception;

	public AttributeValue getInstance(String value, String[] params)
			throws Exception {
		if (params == null || params.length < 1) {
			return getInstance(value);
		} else {
			throw new Exception("Invalid method is called.");
		}
	}
}
